Colours Amount (mg L-1) Intra-day precision* Inter-day precision* Average peak area % RSDr SE Average peak area % RDSR SE Dimethyl yellow 5 10 723453 1296319 0.78 1.21 3267 9079 715855 1310675 1.54 1.55 6374 11708 Sudan I 5 10 395516 644395 4.19 1.27 9128 4724 380424 618884 2.46 3.78 5342 13510 Sudan II 5 10 189997 331961 1.27 2.72 1396 5217 190848 337181 0.98 1.41 1083 2751 Sudan III 5 10 256179 413646 4.32 2.96 6390 7072 254170 420837 4.19 2.64 6150 6430 Sudan IV 5 10 179689 317106 0.62 3.44 644 6307 179494 325494 0.70 1.75 724 3299 * Data is derived from triplicate values

Table 5: Intra- and inter-day precision of dyes.